The geology of a structurally complex part of the Arabian Shield which has been subjected to four successive phases of deformation over a considerable period of time, has been extended by Landsat image analysis. The lithologies are Proterozoic metavolcanics, metasediments, gneisses and granites. Their macroscopic structures, identified on the ground by traditional geological mapping methods, have been extrapolated and hence new information about the regional tectonics has been obtained. Thus the use of multispectral satellite sensor image data has proved to be an excellent tool for geological mapping on a regional scale in crystalline basement terrains.